The purpose of this study is to describe the pediatric and adult patients (U.S. and foreign residents) diagnosed with malaria and treated with artemether-lumefantrine with regard to their demographics, including evaluation of their malaria immune status, treatment effectiveness, prior and concomitant medication use, and the occurrence of adverse events in association with artemether-lumefantrine treatment, based on the information collected in the CDC Malaria Case Surveillance Report Form.